package com.zh.mall.component;

import com.zh.mall.common.utils.JwtTokenUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * JWT登录授权过滤器
 * @author ZhengHao
 * Created At 2022/7/18.
 **/
@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
   private static final Logger LOGGER = LoggerFactory.getLogger(JwtAuthenticationTokenFilter.class);
   @Autowired
   private UserDetailsService userDetailsService;
   @Autowired
   private JwtTokenUtil jwtTokenUtil;
   @Value("${jwt.tokenHeader}")
   private String tokenHeader;
   @Value("${jwt.tokenHead}")
   private String tokenHead;
    @Override
    protected void doFilterInternal(HttpServletRequest request,
                                    HttpServletResponse response,
                                    FilterChain filterChain) throws ServletException, IOException {
        String authHeader = request.getHeader(this.tokenHeader);
        if (authHeader != null && authHeader.startsWith(this.tokenHead)){
            // The part after "Bearer " ：获取"Bearer "后面的token字符串部分
            String authToken = authHeader.substring(this.tokenHead.length());
            String username = jwtTokenUtil.getUserNameFromToken(authToken);
            LOGGER.info("checking username:{}",username);
            if (username != null && SecurityContextHolder.getContext().getAuthentication() == null){
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                if (jwtTokenUtil.validateToken(authToken,userDetails)){
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                    authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    LOGGER.info("authenticated user:{}",username);
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
            }
        }
        filterChain.doFilter(request,response);
    }
}